The Republican candidate took a jab at Tesla while discussing tax breaks to energy companies. He criticized U.S. President Barack Obama for providing "$90 billion in breaks to the green energy world."

"Now, I like green energy as well, but that's about 50 years' worth of what oil and gas receives," Romney said. "You put $90 billion -- like 50 years' worth of breaks -- into solar and wind, to Solyndra and Fisker and Tesla and Ener1. I mean, I had a friend who said, you don't just pick the winners and losers; you pick the losers."

"I am happy to announce that we will initiating an advance payment today to prefund the principal payment that is due in March 2013."

Musk also emphasized that Tesla has "always" made its payments to the Department of Energy on time, and has "never asked to delay replayment ever."

Buzz around the company's new Model S electric sedan has also largely been positive.

Musk commented in June about the impact that Romney would have on the electric car market if he wins November's presidential election.

"I'm not sure he's really against them [electric cars]. He not be as for them as, say, President Obama is," he said. "I think Romney would have a minor impact; I think President Obama would probably have a more positive impact."